Above the A-pillars is the most likely source, but I've also had problems with water getting in the opening in the frame where the door limiters go through the door frame.
Also, you didn't mention if it is in the front or the back, but if it is the back, check for rust inside the rear fenders where they wrap around the seats.
Check that it's not coming in from the doors--bad seals around the window and holes in the plastic lining under the door panels could mean water on the floor during a heavy rain.
Also, if you've been driving, get underneath the truck and look for holes in the floor right around where the carpet is wet.
yep, pull carpet in front, look for missing plugs in the floor pan, when found.......apply duct tape over em
John
[quote author=Jman link=board=1;threadid=12605;start=msg115878#msg115878 date=1078521641]
Check that it's not coming in from the doors--bad seals around the window and holes in the plastic lining under the door panels could mean water on the floor during a heavy rain.
Also, if you've been driving, get underneath the truck and look for holes in the floor right around where the carpet is wet.
aaahhhh yes, the nasty wet carpet syndrome of the '60's series raises it's ugly head yet again.....
in addition to all of the above, also check:
• the glass sweeps, both inner and outer for excessive wear, allowing H2O to penetrate the door cavitiy
• plugged drain holes in the bottom of the doors
• the windshield seal in or around the lower corners; an improper seal/not enough bonding agent can cause H20 leaks; H20 will collect on inside of glass in the lower corners during hard rain/garden hose
• and laugh all you want and believe it or not, check the protruding neck on the wire grommet for the speaker wire - look for cracks and/or gaps in the rubber that create an opportunity for H20 entry; H20 will hit the speaker wire and follow it like a downspout; repair with RTV silicone
all of the above, plus the A-pillar condition, were factors in our soggy '60.....